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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * NET3 IP device support routines. | |
3 | * | |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Derived from the IP parts of dev.c 1.0.19 | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
13 | * | |
14 | * Additional Authors: | |
15 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
16 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
17 | * | |
18 | * Changes: | |
19 | * Alexey Kuznetsov: pa_* fields are replaced with ifaddr | |
20 | * lists. | |
21 | * Cyrus Durgin: updated for kmod | |
22 | * Matthias Andree: in devinet_ioctl, compare label and | |
23 | * address (4.4BSD alias style support), | |
24 | * fall back to comparing just the label | |
25 | * if no match found. | |
26 | */ | |
27 | ||
1da177e4 LT |
28 | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/system.h> | |
31 | #include <linux/bitops.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/kernel.h> | |
1da177e4 LT |
36 | #include <linux/string.h> |
37 | #include <linux/mm.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/sockios.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/interrupt.h> | |
1823730f | 43 | #include <linux/if_addr.h> |
1da177e4 LT |
44 | #include <linux/if_ether.h> |
45 | #include <linux/inet.h> | |
46 | #include <linux/netdevice.h> | |
47 | #include <linux/etherdevice.h> | |
48 | #include <linux/skbuff.h> | |
1da177e4 LT |
49 | #include <linux/init.h> |
50 | #include <linux/notifier.h> | |
51 | #include <linux/inetdevice.h> | |
52 | #include <linux/igmp.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
1da177e4 LT |
54 | #ifdef CONFIG_SYSCTL |
55 | #include <linux/sysctl.h> | |
56 | #endif | |
57 | #include <linux/kmod.h> | |
58 | ||
14c85021 | 59 | #include <net/arp.h> |
1da177e4 LT |
60 | #include <net/ip.h> |
61 | #include <net/route.h> | |
62 | #include <net/ip_fib.h> | |
63f3444f | 63 | #include <net/rtnetlink.h> |
752d14dc | 64 | #include <net/net_namespace.h> |
1da177e4 | 65 | |
0027ba84 | 66 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 67 | .data = { |
02291680 EB |
68 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
69 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
70 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
71 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
42f811b8 | 72 | }, |
1da177e4 LT |
73 | }; |
74 | ||
75 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 | 76 | .data = { |
02291680 EB |
77 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
78 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
79 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
80 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
81 | [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
42f811b8 | 82 | }, |
1da177e4 LT |
83 | }; |
84 | ||
9355bbd6 PE |
85 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
86 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 87 | |
ef7c79ed | 88 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
89 | [IFA_LOCAL] = { .type = NLA_U32 }, |
90 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
91 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 92 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
93 | }; |
94 | ||
d6062cbb | 95 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 96 | |
e041c683 | 97 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
98 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
99 | int destroy); | |
100 | #ifdef CONFIG_SYSCTL | |
66f27a52 | 101 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
102 | static void devinet_sysctl_unregister(struct in_device *idev); |
103 | #else | |
104 | static inline void devinet_sysctl_register(struct in_device *idev) | |
105 | { | |
106 | } | |
107 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
108 | { | |
109 | } | |
1da177e4 LT |
110 | #endif |
111 | ||
112 | /* Locks all the inet devices. */ | |
113 | ||
114 | static struct in_ifaddr *inet_alloc_ifa(void) | |
115 | { | |
93adcc80 | 116 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
117 | } |
118 | ||
119 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
120 | { | |
121 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
122 | if (ifa->ifa_dev) | |
123 | in_dev_put(ifa->ifa_dev); | |
124 | kfree(ifa); | |
125 | } | |
126 | ||
127 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
128 | { | |
129 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
130 | } | |
131 | ||
132 | void in_dev_finish_destroy(struct in_device *idev) | |
133 | { | |
134 | struct net_device *dev = idev->dev; | |
135 | ||
547b792c IJ |
136 | WARN_ON(idev->ifa_list); |
137 | WARN_ON(idev->mc_list); | |
1da177e4 LT |
138 | #ifdef NET_REFCNT_DEBUG |
139 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
140 | idev, dev ? dev->name : "NIL"); | |
141 | #endif | |
142 | dev_put(dev); | |
143 | if (!idev->dead) | |
9f9354b9 ED |
144 | pr_err("Freeing alive in_device %p\n", idev); |
145 | else | |
1da177e4 | 146 | kfree(idev); |
1da177e4 | 147 | } |
9f9354b9 | 148 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 149 | |
71e27da9 | 150 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
151 | { |
152 | struct in_device *in_dev; | |
153 | ||
154 | ASSERT_RTNL(); | |
155 | ||
0da974f4 | 156 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
157 | if (!in_dev) |
158 | goto out; | |
c346dca1 | 159 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 160 | sizeof(in_dev->cnf)); |
1da177e4 LT |
161 | in_dev->cnf.sysctl = NULL; |
162 | in_dev->dev = dev; | |
9f9354b9 ED |
163 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
164 | if (!in_dev->arp_parms) | |
1da177e4 | 165 | goto out_kfree; |
0187bdfb BH |
166 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
167 | dev_disable_lro(dev); | |
1da177e4 LT |
168 | /* Reference in_dev->dev */ |
169 | dev_hold(dev); | |
30c4cf57 | 170 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 171 | in_dev_hold(in_dev); |
1da177e4 | 172 | |
66f27a52 | 173 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
174 | ip_mc_init_dev(in_dev); |
175 | if (dev->flags & IFF_UP) | |
176 | ip_mc_up(in_dev); | |
483479ec | 177 | |
30c4cf57 DS |
178 | /* we can receive as soon as ip_ptr is set -- do this last */ |
179 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 180 | out: |
1da177e4 LT |
181 | return in_dev; |
182 | out_kfree: | |
183 | kfree(in_dev); | |
184 | in_dev = NULL; | |
185 | goto out; | |
186 | } | |
187 | ||
188 | static void in_dev_rcu_put(struct rcu_head *head) | |
189 | { | |
190 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
191 | in_dev_put(idev); | |
192 | } | |
193 | ||
194 | static void inetdev_destroy(struct in_device *in_dev) | |
195 | { | |
196 | struct in_ifaddr *ifa; | |
197 | struct net_device *dev; | |
198 | ||
199 | ASSERT_RTNL(); | |
200 | ||
201 | dev = in_dev->dev; | |
1da177e4 LT |
202 | |
203 | in_dev->dead = 1; | |
204 | ||
205 | ip_mc_destroy_dev(in_dev); | |
206 | ||
207 | while ((ifa = in_dev->ifa_list) != NULL) { | |
208 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
209 | inet_free_ifa(ifa); | |
210 | } | |
211 | ||
95ae6b22 | 212 | rcu_assign_pointer(dev->ip_ptr, NULL); |
1da177e4 | 213 | |
51602b2a | 214 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
215 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
216 | arp_ifdown(dev); | |
217 | ||
218 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
219 | } | |
220 | ||
ff428d72 | 221 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
222 | { |
223 | rcu_read_lock(); | |
224 | for_primary_ifa(in_dev) { | |
225 | if (inet_ifa_match(a, ifa)) { | |
226 | if (!b || inet_ifa_match(b, ifa)) { | |
227 | rcu_read_unlock(); | |
228 | return 1; | |
229 | } | |
230 | } | |
231 | } endfor_ifa(in_dev); | |
232 | rcu_read_unlock(); | |
233 | return 0; | |
234 | } | |
235 | ||
d6062cbb TG |
236 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
237 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 238 | { |
8f937c60 | 239 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
240 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
241 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
242 | struct in_ifaddr *prev_prom = NULL; | |
243 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
244 | |
245 | ASSERT_RTNL(); | |
246 | ||
e905a9ed | 247 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
248 | * unless alias promotion is set |
249 | **/ | |
1da177e4 LT |
250 | |
251 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
252 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
253 | ||
254 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 255 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
256 | ifa1->ifa_scope <= ifa->ifa_scope) |
257 | last_prim = ifa; | |
258 | ||
1da177e4 LT |
259 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
260 | ifa1->ifa_mask != ifa->ifa_mask || | |
261 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
262 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 263 | prev_prom = ifa; |
1da177e4 LT |
264 | continue; |
265 | } | |
266 | ||
0ff60a45 | 267 | if (!do_promote) { |
8f937c60 | 268 | *ifap1 = ifa->ifa_next; |
1da177e4 | 269 | |
d6062cbb | 270 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
271 | blocking_notifier_call_chain(&inetaddr_chain, |
272 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
273 | inet_free_ifa(ifa); |
274 | } else { | |
275 | promote = ifa; | |
276 | break; | |
277 | } | |
1da177e4 LT |
278 | } |
279 | } | |
280 | ||
281 | /* 2. Unlink it */ | |
282 | ||
283 | *ifap = ifa1->ifa_next; | |
284 | ||
285 | /* 3. Announce address deletion */ | |
286 | ||
287 | /* Send message first, then call notifier. | |
288 | At first sight, FIB update triggered by notifier | |
289 | will refer to already deleted ifaddr, that could confuse | |
290 | netlink listeners. It is not true: look, gated sees | |
291 | that route deleted and if it still thinks that ifaddr | |
292 | is valid, it will try to restore deleted routes... Grr. | |
293 | So that, this order is correct. | |
294 | */ | |
d6062cbb | 295 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 296 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 297 | |
0ff60a45 JHS |
298 | if (promote) { |
299 | ||
300 | if (prev_prom) { | |
301 | prev_prom->ifa_next = promote->ifa_next; | |
302 | promote->ifa_next = last_prim->ifa_next; | |
303 | last_prim->ifa_next = promote; | |
304 | } | |
8f937c60 | 305 | |
8f937c60 | 306 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 307 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
308 | blocking_notifier_call_chain(&inetaddr_chain, |
309 | NETDEV_UP, promote); | |
0ff60a45 JHS |
310 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
311 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
312 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
313 | continue; | |
314 | fib_add_ifaddr(ifa); | |
315 | } | |
316 | ||
317 | } | |
6363097c | 318 | if (destroy) |
0ff60a45 | 319 | inet_free_ifa(ifa1); |
1da177e4 LT |
320 | } |
321 | ||
d6062cbb TG |
322 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
323 | int destroy) | |
324 | { | |
325 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
326 | } | |
327 | ||
328 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
329 | u32 pid) | |
1da177e4 LT |
330 | { |
331 | struct in_device *in_dev = ifa->ifa_dev; | |
332 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
333 | ||
334 | ASSERT_RTNL(); | |
335 | ||
336 | if (!ifa->ifa_local) { | |
337 | inet_free_ifa(ifa); | |
338 | return 0; | |
339 | } | |
340 | ||
341 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
342 | last_primary = &in_dev->ifa_list; | |
343 | ||
344 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
345 | ifap = &ifa1->ifa_next) { | |
346 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
347 | ifa->ifa_scope <= ifa1->ifa_scope) | |
348 | last_primary = &ifa1->ifa_next; | |
349 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
350 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
351 | if (ifa1->ifa_local == ifa->ifa_local) { | |
352 | inet_free_ifa(ifa); | |
353 | return -EEXIST; | |
354 | } | |
355 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
356 | inet_free_ifa(ifa); | |
357 | return -EINVAL; | |
358 | } | |
359 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
360 | } | |
361 | } | |
362 | ||
363 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
364 | net_srandom(ifa->ifa_local); | |
365 | ifap = last_primary; | |
366 | } | |
367 | ||
368 | ifa->ifa_next = *ifap; | |
369 | *ifap = ifa; | |
370 | ||
371 | /* Send message first, then call notifier. | |
372 | Notifier will trigger FIB update, so that | |
373 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 374 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 375 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
376 | |
377 | return 0; | |
378 | } | |
379 | ||
d6062cbb TG |
380 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
381 | { | |
382 | return __inet_insert_ifa(ifa, NULL, 0); | |
383 | } | |
384 | ||
1da177e4 LT |
385 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
386 | { | |
e5ed6399 | 387 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
388 | |
389 | ASSERT_RTNL(); | |
390 | ||
391 | if (!in_dev) { | |
71e27da9 HX |
392 | inet_free_ifa(ifa); |
393 | return -ENOBUFS; | |
1da177e4 | 394 | } |
71e27da9 | 395 | ipv4_devconf_setall(in_dev); |
1da177e4 | 396 | if (ifa->ifa_dev != in_dev) { |
547b792c | 397 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
398 | in_dev_hold(in_dev); |
399 | ifa->ifa_dev = in_dev; | |
400 | } | |
f97c1e0c | 401 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
402 | ifa->ifa_scope = RT_SCOPE_HOST; |
403 | return inet_insert_ifa(ifa); | |
404 | } | |
405 | ||
8723e1b4 ED |
406 | /* Caller must hold RCU or RTNL : |
407 | * We dont take a reference on found in_device | |
408 | */ | |
7fee0ca2 | 409 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
410 | { |
411 | struct net_device *dev; | |
412 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
413 | |
414 | rcu_read_lock(); | |
415 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 416 | if (dev) |
8723e1b4 | 417 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 418 | rcu_read_unlock(); |
1da177e4 LT |
419 | return in_dev; |
420 | } | |
9f9354b9 | 421 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
422 | |
423 | /* Called only from RTNL semaphored context. No locks. */ | |
424 | ||
60cad5da AV |
425 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
426 | __be32 mask) | |
1da177e4 LT |
427 | { |
428 | ASSERT_RTNL(); | |
429 | ||
430 | for_primary_ifa(in_dev) { | |
431 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
432 | return ifa; | |
433 | } endfor_ifa(in_dev); | |
434 | return NULL; | |
435 | } | |
436 | ||
437 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
438 | { | |
3b1e0a65 | 439 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 440 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 441 | struct in_device *in_dev; |
dfdd5fd4 | 442 | struct ifaddrmsg *ifm; |
1da177e4 | 443 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 444 | int err = -EINVAL; |
1da177e4 LT |
445 | |
446 | ASSERT_RTNL(); | |
447 | ||
dfdd5fd4 TG |
448 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
449 | if (err < 0) | |
450 | goto errout; | |
451 | ||
452 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 453 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
454 | if (in_dev == NULL) { |
455 | err = -ENODEV; | |
456 | goto errout; | |
457 | } | |
458 | ||
1da177e4 LT |
459 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
460 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 461 | if (tb[IFA_LOCAL] && |
a7a628c4 | 462 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
463 | continue; |
464 | ||
465 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 466 | continue; |
dfdd5fd4 TG |
467 | |
468 | if (tb[IFA_ADDRESS] && | |
469 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 470 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
471 | continue; |
472 | ||
d6062cbb | 473 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
474 | return 0; |
475 | } | |
dfdd5fd4 TG |
476 | |
477 | err = -EADDRNOTAVAIL; | |
478 | errout: | |
479 | return err; | |
1da177e4 LT |
480 | } |
481 | ||
4b8aa9ab | 482 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 483 | { |
5c753978 TG |
484 | struct nlattr *tb[IFA_MAX+1]; |
485 | struct in_ifaddr *ifa; | |
486 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
487 | struct net_device *dev; |
488 | struct in_device *in_dev; | |
7b218574 | 489 | int err; |
1da177e4 | 490 | |
5c753978 TG |
491 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
492 | if (err < 0) | |
493 | goto errout; | |
1da177e4 | 494 | |
5c753978 | 495 | ifm = nlmsg_data(nlh); |
7b218574 DL |
496 | err = -EINVAL; |
497 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 498 | goto errout; |
1da177e4 | 499 | |
4b8aa9ab | 500 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
501 | err = -ENODEV; |
502 | if (dev == NULL) | |
5c753978 | 503 | goto errout; |
1da177e4 | 504 | |
5c753978 | 505 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
506 | err = -ENOBUFS; |
507 | if (in_dev == NULL) | |
71e27da9 | 508 | goto errout; |
1da177e4 | 509 | |
5c753978 | 510 | ifa = inet_alloc_ifa(); |
7b218574 | 511 | if (ifa == NULL) |
5c753978 TG |
512 | /* |
513 | * A potential indev allocation can be left alive, it stays | |
514 | * assigned to its device and is destroy with it. | |
515 | */ | |
5c753978 | 516 | goto errout; |
5c753978 | 517 | |
a4e65d36 | 518 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
519 | in_dev_hold(in_dev); |
520 | ||
521 | if (tb[IFA_ADDRESS] == NULL) | |
522 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 523 | |
1da177e4 LT |
524 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
525 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
526 | ifa->ifa_flags = ifm->ifa_flags; |
527 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
528 | ifa->ifa_dev = in_dev; |
529 | ||
a7a628c4 AV |
530 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
531 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
532 | |
533 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 534 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 535 | |
5c753978 TG |
536 | if (tb[IFA_LABEL]) |
537 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
538 | else |
539 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
540 | ||
5c753978 TG |
541 | return ifa; |
542 | ||
543 | errout: | |
544 | return ERR_PTR(err); | |
545 | } | |
546 | ||
547 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
548 | { | |
3b1e0a65 | 549 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
550 | struct in_ifaddr *ifa; |
551 | ||
552 | ASSERT_RTNL(); | |
553 | ||
4b8aa9ab | 554 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
555 | if (IS_ERR(ifa)) |
556 | return PTR_ERR(ifa); | |
557 | ||
d6062cbb | 558 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
559 | } |
560 | ||
561 | /* | |
562 | * Determine a default network mask, based on the IP address. | |
563 | */ | |
564 | ||
9f9354b9 | 565 | static inline int inet_abc_len(__be32 addr) |
1da177e4 LT |
566 | { |
567 | int rc = -1; /* Something else, probably a multicast. */ | |
568 | ||
f97c1e0c | 569 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 570 | rc = 0; |
1da177e4 | 571 | else { |
714e85be | 572 | __u32 haddr = ntohl(addr); |
1da177e4 | 573 | |
714e85be | 574 | if (IN_CLASSA(haddr)) |
1da177e4 | 575 | rc = 8; |
714e85be | 576 | else if (IN_CLASSB(haddr)) |
1da177e4 | 577 | rc = 16; |
714e85be | 578 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
579 | rc = 24; |
580 | } | |
581 | ||
e905a9ed | 582 | return rc; |
1da177e4 LT |
583 | } |
584 | ||
585 | ||
e5b13cb1 | 586 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
587 | { |
588 | struct ifreq ifr; | |
589 | struct sockaddr_in sin_orig; | |
590 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
591 | struct in_device *in_dev; | |
592 | struct in_ifaddr **ifap = NULL; | |
593 | struct in_ifaddr *ifa = NULL; | |
594 | struct net_device *dev; | |
595 | char *colon; | |
596 | int ret = -EFAULT; | |
597 | int tryaddrmatch = 0; | |
598 | ||
599 | /* | |
600 | * Fetch the caller's info block into kernel space | |
601 | */ | |
602 | ||
603 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
604 | goto out; | |
605 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
606 | ||
607 | /* save original address for comparison */ | |
608 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
609 | ||
610 | colon = strchr(ifr.ifr_name, ':'); | |
611 | if (colon) | |
612 | *colon = 0; | |
613 | ||
e5b13cb1 | 614 | dev_load(net, ifr.ifr_name); |
1da177e4 | 615 | |
132adf54 | 616 | switch (cmd) { |
1da177e4 LT |
617 | case SIOCGIFADDR: /* Get interface address */ |
618 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
619 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
620 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
621 | /* Note that these ioctls will not sleep, | |
622 | so that we do not impose a lock. | |
623 | One day we will be forced to put shlock here (I mean SMP) | |
624 | */ | |
625 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
626 | memset(sin, 0, sizeof(*sin)); | |
627 | sin->sin_family = AF_INET; | |
628 | break; | |
629 | ||
630 | case SIOCSIFFLAGS: | |
631 | ret = -EACCES; | |
632 | if (!capable(CAP_NET_ADMIN)) | |
633 | goto out; | |
634 | break; | |
635 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
636 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
637 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
638 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
639 | ret = -EACCES; | |
640 | if (!capable(CAP_NET_ADMIN)) | |
641 | goto out; | |
642 | ret = -EINVAL; | |
643 | if (sin->sin_family != AF_INET) | |
644 | goto out; | |
645 | break; | |
646 | default: | |
647 | ret = -EINVAL; | |
648 | goto out; | |
649 | } | |
650 | ||
651 | rtnl_lock(); | |
652 | ||
653 | ret = -ENODEV; | |
9f9354b9 ED |
654 | dev = __dev_get_by_name(net, ifr.ifr_name); |
655 | if (!dev) | |
1da177e4 LT |
656 | goto done; |
657 | ||
658 | if (colon) | |
659 | *colon = ':'; | |
660 | ||
9f9354b9 ED |
661 | in_dev = __in_dev_get_rtnl(dev); |
662 | if (in_dev) { | |
1da177e4 LT |
663 | if (tryaddrmatch) { |
664 | /* Matthias Andree */ | |
665 | /* compare label and address (4.4BSD style) */ | |
666 | /* note: we only do this for a limited set of ioctls | |
667 | and only if the original address family was AF_INET. | |
668 | This is checked above. */ | |
669 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
670 | ifap = &ifa->ifa_next) { | |
671 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
672 | sin_orig.sin_addr.s_addr == | |
673 | ifa->ifa_address) { | |
674 | break; /* found */ | |
675 | } | |
676 | } | |
677 | } | |
678 | /* we didn't get a match, maybe the application is | |
679 | 4.3BSD-style and passed in junk so we fall back to | |
680 | comparing just the label */ | |
681 | if (!ifa) { | |
682 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
683 | ifap = &ifa->ifa_next) | |
684 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | ret = -EADDRNOTAVAIL; | |
690 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
691 | goto done; | |
692 | ||
132adf54 | 693 | switch (cmd) { |
1da177e4 LT |
694 | case SIOCGIFADDR: /* Get interface address */ |
695 | sin->sin_addr.s_addr = ifa->ifa_local; | |
696 | goto rarok; | |
697 | ||
698 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
699 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
700 | goto rarok; | |
701 | ||
702 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
703 | sin->sin_addr.s_addr = ifa->ifa_address; | |
704 | goto rarok; | |
705 | ||
706 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
707 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
708 | goto rarok; | |
709 | ||
710 | case SIOCSIFFLAGS: | |
711 | if (colon) { | |
712 | ret = -EADDRNOTAVAIL; | |
713 | if (!ifa) | |
714 | break; | |
715 | ret = 0; | |
716 | if (!(ifr.ifr_flags & IFF_UP)) | |
717 | inet_del_ifa(in_dev, ifap, 1); | |
718 | break; | |
719 | } | |
720 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
721 | break; | |
722 | ||
723 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
724 | ret = -EINVAL; | |
725 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
726 | break; | |
727 | ||
728 | if (!ifa) { | |
729 | ret = -ENOBUFS; | |
9f9354b9 ED |
730 | ifa = inet_alloc_ifa(); |
731 | if (!ifa) | |
1da177e4 LT |
732 | break; |
733 | if (colon) | |
734 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
735 | else | |
736 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
737 | } else { | |
738 | ret = 0; | |
739 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
740 | break; | |
741 | inet_del_ifa(in_dev, ifap, 0); | |
742 | ifa->ifa_broadcast = 0; | |
148f9729 | 743 | ifa->ifa_scope = 0; |
1da177e4 LT |
744 | } |
745 | ||
746 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
747 | ||
748 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
749 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
750 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
751 | if ((dev->flags & IFF_BROADCAST) && | |
752 | ifa->ifa_prefixlen < 31) | |
753 | ifa->ifa_broadcast = ifa->ifa_address | | |
754 | ~ifa->ifa_mask; | |
755 | } else { | |
756 | ifa->ifa_prefixlen = 32; | |
757 | ifa->ifa_mask = inet_make_mask(32); | |
758 | } | |
759 | ret = inet_set_ifa(dev, ifa); | |
760 | break; | |
761 | ||
762 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
763 | ret = 0; | |
764 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
765 | inet_del_ifa(in_dev, ifap, 0); | |
766 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
767 | inet_insert_ifa(ifa); | |
768 | } | |
769 | break; | |
770 | ||
771 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
772 | ret = 0; | |
773 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
774 | break; | |
775 | ret = -EINVAL; | |
776 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
777 | break; | |
778 | ret = 0; | |
779 | inet_del_ifa(in_dev, ifap, 0); | |
780 | ifa->ifa_address = sin->sin_addr.s_addr; | |
781 | inet_insert_ifa(ifa); | |
782 | break; | |
783 | ||
784 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
785 | ||
786 | /* | |
787 | * The mask we set must be legal. | |
788 | */ | |
789 | ret = -EINVAL; | |
790 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
791 | break; | |
792 | ret = 0; | |
793 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 794 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
795 | inet_del_ifa(in_dev, ifap, 0); |
796 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
797 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
798 | ||
799 | /* See if current broadcast address matches | |
800 | * with current netmask, then recalculate | |
801 | * the broadcast address. Otherwise it's a | |
802 | * funny address, so don't touch it since | |
803 | * the user seems to know what (s)he's doing... | |
804 | */ | |
805 | if ((dev->flags & IFF_BROADCAST) && | |
806 | (ifa->ifa_prefixlen < 31) && | |
807 | (ifa->ifa_broadcast == | |
dcab5e1e | 808 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
809 | ifa->ifa_broadcast = (ifa->ifa_local | |
810 | ~sin->sin_addr.s_addr); | |
811 | } | |
812 | inet_insert_ifa(ifa); | |
813 | } | |
814 | break; | |
815 | } | |
816 | done: | |
817 | rtnl_unlock(); | |
818 | out: | |
819 | return ret; | |
820 | rarok: | |
821 | rtnl_unlock(); | |
822 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
823 | goto out; | |
824 | } | |
825 | ||
826 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
827 | { | |
e5ed6399 | 828 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
829 | struct in_ifaddr *ifa; |
830 | struct ifreq ifr; | |
831 | int done = 0; | |
832 | ||
9f9354b9 | 833 | if (!in_dev) |
1da177e4 LT |
834 | goto out; |
835 | ||
9f9354b9 | 836 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
837 | if (!buf) { |
838 | done += sizeof(ifr); | |
839 | continue; | |
840 | } | |
841 | if (len < (int) sizeof(ifr)) | |
842 | break; | |
843 | memset(&ifr, 0, sizeof(struct ifreq)); | |
844 | if (ifa->ifa_label) | |
845 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
846 | else | |
847 | strcpy(ifr.ifr_name, dev->name); | |
848 | ||
849 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
850 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
851 | ifa->ifa_local; | |
852 | ||
853 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
854 | done = -EFAULT; | |
855 | break; | |
856 | } | |
857 | buf += sizeof(struct ifreq); | |
858 | len -= sizeof(struct ifreq); | |
859 | done += sizeof(struct ifreq); | |
860 | } | |
861 | out: | |
862 | return done; | |
863 | } | |
864 | ||
a61ced5d | 865 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 866 | { |
a61ced5d | 867 | __be32 addr = 0; |
1da177e4 | 868 | struct in_device *in_dev; |
c346dca1 | 869 | struct net *net = dev_net(dev); |
1da177e4 LT |
870 | |
871 | rcu_read_lock(); | |
e5ed6399 | 872 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
873 | if (!in_dev) |
874 | goto no_in_dev; | |
875 | ||
876 | for_primary_ifa(in_dev) { | |
877 | if (ifa->ifa_scope > scope) | |
878 | continue; | |
879 | if (!dst || inet_ifa_match(dst, ifa)) { | |
880 | addr = ifa->ifa_local; | |
881 | break; | |
882 | } | |
883 | if (!addr) | |
884 | addr = ifa->ifa_local; | |
885 | } endfor_ifa(in_dev); | |
1da177e4 LT |
886 | |
887 | if (addr) | |
c6d14c84 | 888 | goto out_unlock; |
9f9354b9 | 889 | no_in_dev: |
1da177e4 LT |
890 | |
891 | /* Not loopback addresses on loopback should be preferred | |
892 | in this case. It is importnat that lo is the first interface | |
893 | in dev_base list. | |
894 | */ | |
c6d14c84 | 895 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
896 | in_dev = __in_dev_get_rcu(dev); |
897 | if (!in_dev) | |
1da177e4 LT |
898 | continue; |
899 | ||
900 | for_primary_ifa(in_dev) { | |
901 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
902 | ifa->ifa_scope <= scope) { | |
903 | addr = ifa->ifa_local; | |
c6d14c84 | 904 | goto out_unlock; |
1da177e4 LT |
905 | } |
906 | } endfor_ifa(in_dev); | |
907 | } | |
c6d14c84 | 908 | out_unlock: |
1da177e4 | 909 | rcu_read_unlock(); |
1da177e4 LT |
910 | return addr; |
911 | } | |
9f9354b9 | 912 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 913 | |
60cad5da AV |
914 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
915 | __be32 local, int scope) | |
1da177e4 LT |
916 | { |
917 | int same = 0; | |
a144ea4b | 918 | __be32 addr = 0; |
1da177e4 LT |
919 | |
920 | for_ifa(in_dev) { | |
921 | if (!addr && | |
922 | (local == ifa->ifa_local || !local) && | |
923 | ifa->ifa_scope <= scope) { | |
924 | addr = ifa->ifa_local; | |
925 | if (same) | |
926 | break; | |
927 | } | |
928 | if (!same) { | |
929 | same = (!local || inet_ifa_match(local, ifa)) && | |
930 | (!dst || inet_ifa_match(dst, ifa)); | |
931 | if (same && addr) { | |
932 | if (local || !dst) | |
933 | break; | |
934 | /* Is the selected addr into dst subnet? */ | |
935 | if (inet_ifa_match(addr, ifa)) | |
936 | break; | |
937 | /* No, then can we use new local src? */ | |
938 | if (ifa->ifa_scope <= scope) { | |
939 | addr = ifa->ifa_local; | |
940 | break; | |
941 | } | |
942 | /* search for large dst subnet for addr */ | |
943 | same = 0; | |
944 | } | |
945 | } | |
946 | } endfor_ifa(in_dev); | |
947 | ||
9f9354b9 | 948 | return same ? addr : 0; |
1da177e4 LT |
949 | } |
950 | ||
951 | /* | |
952 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 953 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
954 | * - dst: only in the same subnet as dst, 0=any dst |
955 | * - local: address, 0=autoselect the local address | |
956 | * - scope: maximum allowed scope value for the local address | |
957 | */ | |
9bd85e32 DL |
958 | __be32 inet_confirm_addr(struct in_device *in_dev, |
959 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 960 | { |
60cad5da | 961 | __be32 addr = 0; |
9bd85e32 | 962 | struct net_device *dev; |
39a6d063 | 963 | struct net *net; |
1da177e4 | 964 | |
39a6d063 | 965 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 966 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 967 | |
c346dca1 | 968 | net = dev_net(in_dev->dev); |
1da177e4 | 969 | rcu_read_lock(); |
c6d14c84 | 970 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
971 | in_dev = __in_dev_get_rcu(dev); |
972 | if (in_dev) { | |
1da177e4 LT |
973 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
974 | if (addr) | |
975 | break; | |
976 | } | |
977 | } | |
978 | rcu_read_unlock(); | |
1da177e4 LT |
979 | |
980 | return addr; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Device notifier | |
985 | */ | |
986 | ||
987 | int register_inetaddr_notifier(struct notifier_block *nb) | |
988 | { | |
e041c683 | 989 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 990 | } |
9f9354b9 | 991 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
992 | |
993 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
994 | { | |
e041c683 | 995 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 996 | } |
9f9354b9 | 997 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 998 | |
9f9354b9 ED |
999 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1000 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1001 | */ |
1002 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1003 | { |
1da177e4 LT |
1004 | struct in_ifaddr *ifa; |
1005 | int named = 0; | |
1006 | ||
e905a9ed YH |
1007 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1008 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1009 | |
1010 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1011 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1012 | if (named++ == 0) |
573bf470 | 1013 | goto skip; |
44344b2a | 1014 | dot = strchr(old, ':'); |
e905a9ed YH |
1015 | if (dot == NULL) { |
1016 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1017 | dot = old; |
1018 | } | |
9f9354b9 | 1019 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1020 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1021 | else |
e905a9ed | 1022 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1023 | skip: |
1024 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1025 | } |
1026 | } | |
1da177e4 | 1027 | |
06770843 BL |
1028 | static inline bool inetdev_valid_mtu(unsigned mtu) |
1029 | { | |
1030 | return mtu >= 68; | |
1031 | } | |
1032 | ||
1da177e4 LT |
1033 | /* Called only under RTNL semaphore */ |
1034 | ||
1035 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1036 | void *ptr) | |
1037 | { | |
1038 | struct net_device *dev = ptr; | |
e5ed6399 | 1039 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1040 | |
1041 | ASSERT_RTNL(); | |
1042 | ||
1043 | if (!in_dev) { | |
8030f544 | 1044 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1045 | in_dev = inetdev_init(dev); |
b217d616 HX |
1046 | if (!in_dev) |
1047 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1048 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1049 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1050 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1051 | } |
06770843 BL |
1052 | } else if (event == NETDEV_CHANGEMTU) { |
1053 | /* Re-enabling IP */ | |
1054 | if (inetdev_valid_mtu(dev->mtu)) | |
1055 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1056 | } |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | switch (event) { | |
1061 | case NETDEV_REGISTER: | |
1062 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
95ae6b22 | 1063 | rcu_assign_pointer(dev->ip_ptr, NULL); |
1da177e4 LT |
1064 | break; |
1065 | case NETDEV_UP: | |
06770843 | 1066 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1067 | break; |
0cc217e1 | 1068 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1069 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1070 | ||
1071 | if (ifa) { | |
1da177e4 LT |
1072 | ifa->ifa_local = |
1073 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1074 | ifa->ifa_prefixlen = 8; | |
1075 | ifa->ifa_mask = inet_make_mask(8); | |
1076 | in_dev_hold(in_dev); | |
1077 | ifa->ifa_dev = in_dev; | |
1078 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1079 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1080 | inet_insert_ifa(ifa); | |
1081 | } | |
1082 | } | |
1083 | ip_mc_up(in_dev); | |
eefef1cf | 1084 | /* fall through */ |
06c4648d | 1085 | case NETDEV_NOTIFY_PEERS: |
eefef1cf | 1086 | case NETDEV_CHANGEADDR: |
a21090cf SH |
1087 | /* Send gratuitous ARP to notify of link change */ |
1088 | if (IN_DEV_ARP_NOTIFY(in_dev)) { | |
1089 | struct in_ifaddr *ifa = in_dev->ifa_list; | |
1090 | ||
1091 | if (ifa) | |
1092 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1093 | ifa->ifa_address, dev, | |
1094 | ifa->ifa_address, NULL, | |
1095 | dev->dev_addr, NULL); | |
1096 | } | |
1da177e4 LT |
1097 | break; |
1098 | case NETDEV_DOWN: | |
1099 | ip_mc_down(in_dev); | |
1100 | break; | |
93d9b7d7 | 1101 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1102 | ip_mc_unmap(in_dev); |
1103 | break; | |
93d9b7d7 | 1104 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1105 | ip_mc_remap(in_dev); |
1106 | break; | |
1da177e4 | 1107 | case NETDEV_CHANGEMTU: |
06770843 | 1108 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1109 | break; |
06770843 | 1110 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1111 | case NETDEV_UNREGISTER: |
1112 | inetdev_destroy(in_dev); | |
1113 | break; | |
1114 | case NETDEV_CHANGENAME: | |
1115 | /* Do not notify about label change, this event is | |
1116 | * not interesting to applications using netlink. | |
1117 | */ | |
1118 | inetdev_changename(dev, in_dev); | |
1119 | ||
51602b2a | 1120 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1121 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1122 | break; |
1123 | } | |
1124 | out: | |
1125 | return NOTIFY_DONE; | |
1126 | } | |
1127 | ||
1128 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1129 | .notifier_call = inetdev_event, |
1da177e4 LT |
1130 | }; |
1131 | ||
339bf98f TG |
1132 | static inline size_t inet_nlmsg_size(void) |
1133 | { | |
1134 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1135 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1136 | + nla_total_size(4) /* IFA_LOCAL */ | |
1137 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1138 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1139 | } | |
1140 | ||
1da177e4 | 1141 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1142 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1143 | { |
1144 | struct ifaddrmsg *ifm; | |
1145 | struct nlmsghdr *nlh; | |
1da177e4 | 1146 | |
47f68512 TG |
1147 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1148 | if (nlh == NULL) | |
26932566 | 1149 | return -EMSGSIZE; |
47f68512 TG |
1150 | |
1151 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1152 | ifm->ifa_family = AF_INET; |
1153 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1154 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1155 | ifm->ifa_scope = ifa->ifa_scope; | |
1156 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1157 | |
1da177e4 | 1158 | if (ifa->ifa_address) |
a7a628c4 | 1159 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1160 | |
1da177e4 | 1161 | if (ifa->ifa_local) |
a7a628c4 | 1162 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1163 | |
1da177e4 | 1164 | if (ifa->ifa_broadcast) |
a7a628c4 | 1165 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1166 | |
1da177e4 | 1167 | if (ifa->ifa_label[0]) |
47f68512 | 1168 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1169 | |
47f68512 TG |
1170 | return nlmsg_end(skb, nlh); |
1171 | ||
1172 | nla_put_failure: | |
26932566 PM |
1173 | nlmsg_cancel(skb, nlh); |
1174 | return -EMSGSIZE; | |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1178 | { | |
3b1e0a65 | 1179 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1180 | int h, s_h; |
1181 | int idx, s_idx; | |
1182 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1183 | struct net_device *dev; |
1184 | struct in_device *in_dev; | |
1185 | struct in_ifaddr *ifa; | |
eec4df98 ED |
1186 | struct hlist_head *head; |
1187 | struct hlist_node *node; | |
1da177e4 | 1188 | |
eec4df98 ED |
1189 | s_h = cb->args[0]; |
1190 | s_idx = idx = cb->args[1]; | |
1191 | s_ip_idx = ip_idx = cb->args[2]; | |
1192 | ||
1193 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1194 | idx = 0; | |
1195 | head = &net->dev_index_head[h]; | |
1196 | rcu_read_lock(); | |
1197 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
1198 | if (idx < s_idx) | |
1199 | goto cont; | |
4b97efdf | 1200 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1201 | s_ip_idx = 0; |
1202 | in_dev = __in_dev_get_rcu(dev); | |
1203 | if (!in_dev) | |
1204 | goto cont; | |
1da177e4 | 1205 | |
eec4df98 ED |
1206 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1207 | ifa = ifa->ifa_next, ip_idx++) { | |
1208 | if (ip_idx < s_ip_idx) | |
1209 | continue; | |
1210 | if (inet_fill_ifaddr(skb, ifa, | |
1211 | NETLINK_CB(cb->skb).pid, | |
1da177e4 | 1212 | cb->nlh->nlmsg_seq, |
eec4df98 ED |
1213 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1214 | rcu_read_unlock(); | |
1215 | goto done; | |
1216 | } | |
1217 | } | |
7562f876 | 1218 | cont: |
eec4df98 ED |
1219 | idx++; |
1220 | } | |
1221 | rcu_read_unlock(); | |
1da177e4 LT |
1222 | } |
1223 | ||
1224 | done: | |
eec4df98 ED |
1225 | cb->args[0] = h; |
1226 | cb->args[1] = idx; | |
1227 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1228 | |
1229 | return skb->len; | |
1230 | } | |
1231 | ||
539afedf | 1232 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
d6062cbb | 1233 | u32 pid) |
1da177e4 | 1234 | { |
47f68512 | 1235 | struct sk_buff *skb; |
d6062cbb TG |
1236 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1237 | int err = -ENOBUFS; | |
4b8aa9ab | 1238 | struct net *net; |
1da177e4 | 1239 | |
c346dca1 | 1240 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1241 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1242 | if (skb == NULL) |
d6062cbb TG |
1243 | goto errout; |
1244 | ||
1245 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1246 | if (err < 0) { |
1247 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1248 | WARN_ON(err == -EMSGSIZE); | |
1249 | kfree_skb(skb); | |
1250 | goto errout; | |
1251 | } | |
1ce85fe4 PNA |
1252 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1253 | return; | |
d6062cbb TG |
1254 | errout: |
1255 | if (err < 0) | |
4b8aa9ab | 1256 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1257 | } |
1258 | ||
1da177e4 LT |
1259 | #ifdef CONFIG_SYSCTL |
1260 | ||
c0ce9fb3 | 1261 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1262 | { |
1263 | struct net_device *dev; | |
1264 | ||
c6d14c84 ED |
1265 | rcu_read_lock(); |
1266 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 1267 | struct in_device *in_dev; |
c6d14c84 | 1268 | |
31be3085 HX |
1269 | in_dev = __in_dev_get_rcu(dev); |
1270 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1271 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 1272 | } |
c6d14c84 | 1273 | rcu_read_unlock(); |
31be3085 HX |
1274 | } |
1275 | ||
c6d14c84 | 1276 | /* called with RTNL locked */ |
c0ce9fb3 | 1277 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1278 | { |
1279 | struct net_device *dev; | |
586f1211 | 1280 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1281 | |
586f1211 | 1282 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1283 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b | 1284 | |
c0ce9fb3 | 1285 | for_each_netdev(net, dev) { |
68dd299b | 1286 | struct in_device *in_dev; |
0187bdfb BH |
1287 | if (on) |
1288 | dev_disable_lro(dev); | |
68dd299b PE |
1289 | rcu_read_lock(); |
1290 | in_dev = __in_dev_get_rcu(dev); | |
1291 | if (in_dev) | |
1292 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1293 | rcu_read_unlock(); | |
1294 | } | |
68dd299b PE |
1295 | } |
1296 | ||
31be3085 | 1297 | static int devinet_conf_proc(ctl_table *ctl, int write, |
8d65af78 | 1298 | void __user *buffer, |
31be3085 HX |
1299 | size_t *lenp, loff_t *ppos) |
1300 | { | |
8d65af78 | 1301 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
31be3085 HX |
1302 | |
1303 | if (write) { | |
1304 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1305 | struct net *net = ctl->extra2; |
31be3085 HX |
1306 | int i = (int *)ctl->data - cnf->data; |
1307 | ||
1308 | set_bit(i, cnf->state); | |
1309 | ||
9355bbd6 | 1310 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1311 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1312 | } |
1313 | ||
1314 | return ret; | |
1315 | } | |
1316 | ||
1da177e4 | 1317 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
8d65af78 | 1318 | void __user *buffer, |
1da177e4 LT |
1319 | size_t *lenp, loff_t *ppos) |
1320 | { | |
1321 | int *valp = ctl->data; | |
1322 | int val = *valp; | |
88af182e | 1323 | loff_t pos = *ppos; |
8d65af78 | 1324 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
1325 | |
1326 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1327 | struct net *net = ctl->extra2; |
1328 | ||
0187bdfb | 1329 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
1330 | if (!rtnl_trylock()) { |
1331 | /* Restore the original values before restarting */ | |
1332 | *valp = val; | |
1333 | *ppos = pos; | |
9b8adb5e | 1334 | return restart_syscall(); |
88af182e | 1335 | } |
0187bdfb BH |
1336 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
1337 | inet_forward_change(net); | |
1338 | } else if (*valp) { | |
1339 | struct ipv4_devconf *cnf = ctl->extra1; | |
1340 | struct in_device *idev = | |
1341 | container_of(cnf, struct in_device, cnf); | |
1342 | dev_disable_lro(idev->dev); | |
1343 | } | |
1344 | rtnl_unlock(); | |
76e6ebfb | 1345 | rt_cache_flush(net, 0); |
0187bdfb | 1346 | } |
1da177e4 LT |
1347 | } |
1348 | ||
1349 | return ret; | |
1350 | } | |
1351 | ||
1352 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
8d65af78 | 1353 | void __user *buffer, |
1da177e4 LT |
1354 | size_t *lenp, loff_t *ppos) |
1355 | { | |
1356 | int *valp = ctl->data; | |
1357 | int val = *valp; | |
8d65af78 | 1358 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 1359 | struct net *net = ctl->extra2; |
1da177e4 LT |
1360 | |
1361 | if (write && *valp != val) | |
76e6ebfb | 1362 | rt_cache_flush(net, 0); |
1da177e4 LT |
1363 | |
1364 | return ret; | |
1365 | } | |
1366 | ||
f8572d8f | 1367 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 1368 | { \ |
42f811b8 HX |
1369 | .procname = name, \ |
1370 | .data = ipv4_devconf.data + \ | |
02291680 | 1371 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
1372 | .maxlen = sizeof(int), \ |
1373 | .mode = mval, \ | |
1374 | .proc_handler = proc, \ | |
31be3085 | 1375 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1376 | } |
1377 | ||
1378 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 1379 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
1380 | |
1381 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 1382 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 1383 | |
f8572d8f EB |
1384 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
1385 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
1386 | |
1387 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 1388 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 1389 | |
1da177e4 LT |
1390 | static struct devinet_sysctl_table { |
1391 | struct ctl_table_header *sysctl_header; | |
02291680 | 1392 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
bfada697 | 1393 | char *dev_name; |
1da177e4 LT |
1394 | } devinet_sysctl = { |
1395 | .devinet_vars = { | |
42f811b8 | 1396 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 1397 | devinet_sysctl_forward), |
42f811b8 HX |
1398 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1399 | ||
1400 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1401 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1402 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1403 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1404 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1405 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1406 | "accept_source_route"), | |
8153a10c | 1407 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 1408 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
1409 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
1410 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1411 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1412 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1413 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1414 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1415 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1416 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1417 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 1418 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 1419 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
42f811b8 HX |
1420 | |
1421 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1422 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1423 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1424 | "force_igmp_version"), | |
1425 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1426 | "promote_secondaries"), | |
1da177e4 | 1427 | }, |
1da177e4 LT |
1428 | }; |
1429 | ||
ea40b324 | 1430 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 1431 | struct ipv4_devconf *p) |
1da177e4 LT |
1432 | { |
1433 | int i; | |
9fa89642 | 1434 | struct devinet_sysctl_table *t; |
1da177e4 | 1435 | |
bfada697 PE |
1436 | #define DEVINET_CTL_PATH_DEV 3 |
1437 | ||
1438 | struct ctl_path devinet_ctl_path[] = { | |
f8572d8f EB |
1439 | { .procname = "net", }, |
1440 | { .procname = "ipv4", }, | |
1441 | { .procname = "conf", }, | |
bfada697 PE |
1442 | { /* to be set */ }, |
1443 | { }, | |
1444 | }; | |
1445 | ||
9fa89642 | 1446 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1447 | if (!t) |
9fa89642 PE |
1448 | goto out; |
1449 | ||
1da177e4 LT |
1450 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1451 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1452 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1453 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1454 | } |
1455 | ||
e905a9ed YH |
1456 | /* |
1457 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1458 | * by sysctl and we wouldn't want anyone to change it under our feet |
1459 | * (see SIOCSIFNAME). | |
e905a9ed | 1460 | */ |
bfada697 PE |
1461 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1462 | if (!t->dev_name) | |
9fa89642 | 1463 | goto free; |
1da177e4 | 1464 | |
bfada697 | 1465 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1da177e4 | 1466 | |
752d14dc | 1467 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1468 | t->devinet_vars); |
1da177e4 | 1469 | if (!t->sysctl_header) |
9fa89642 | 1470 | goto free_procname; |
1da177e4 LT |
1471 | |
1472 | p->sysctl = t; | |
ea40b324 | 1473 | return 0; |
1da177e4 | 1474 | |
9fa89642 | 1475 | free_procname: |
bfada697 | 1476 | kfree(t->dev_name); |
9fa89642 | 1477 | free: |
1da177e4 | 1478 | kfree(t); |
9fa89642 | 1479 | out: |
ea40b324 | 1480 | return -ENOBUFS; |
1da177e4 LT |
1481 | } |
1482 | ||
51602b2a PE |
1483 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1484 | { | |
1485 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1486 | ||
1487 | if (t == NULL) | |
1488 | return; | |
1489 | ||
1490 | cnf->sysctl = NULL; | |
1491 | unregister_sysctl_table(t->sysctl_header); | |
1492 | kfree(t->dev_name); | |
1493 | kfree(t); | |
1494 | } | |
1495 | ||
66f27a52 PE |
1496 | static void devinet_sysctl_register(struct in_device *idev) |
1497 | { | |
54716e3b | 1498 | neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); |
c346dca1 | 1499 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
f8572d8f | 1500 | &idev->cnf); |
66f27a52 PE |
1501 | } |
1502 | ||
51602b2a | 1503 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1504 | { |
51602b2a PE |
1505 | __devinet_sysctl_unregister(&idev->cnf); |
1506 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1507 | } |
1da177e4 | 1508 | |
68dd299b PE |
1509 | static struct ctl_table ctl_forward_entry[] = { |
1510 | { | |
68dd299b PE |
1511 | .procname = "ip_forward", |
1512 | .data = &ipv4_devconf.data[ | |
02291680 | 1513 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
1514 | .maxlen = sizeof(int), |
1515 | .mode = 0644, | |
1516 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 1517 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 1518 | .extra2 = &init_net, |
68dd299b PE |
1519 | }, |
1520 | { }, | |
1521 | }; | |
1522 | ||
752d14dc | 1523 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
f8572d8f EB |
1524 | { .procname = "net", }, |
1525 | { .procname = "ipv4", }, | |
68dd299b PE |
1526 | { }, |
1527 | }; | |
2a75de0c | 1528 | #endif |
68dd299b | 1529 | |
752d14dc PE |
1530 | static __net_init int devinet_init_net(struct net *net) |
1531 | { | |
1532 | int err; | |
752d14dc | 1533 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1534 | #ifdef CONFIG_SYSCTL |
1535 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1536 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1537 | #endif |
752d14dc PE |
1538 | |
1539 | err = -ENOMEM; | |
1540 | all = &ipv4_devconf; | |
1541 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 1542 | |
09ad9bc7 | 1543 | if (!net_eq(net, &init_net)) { |
752d14dc PE |
1544 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
1545 | if (all == NULL) | |
1546 | goto err_alloc_all; | |
1547 | ||
1548 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1549 | if (dflt == NULL) | |
1550 | goto err_alloc_dflt; | |
1551 | ||
2a75de0c | 1552 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1553 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1554 | if (tbl == NULL) | |
1555 | goto err_alloc_ctl; | |
1556 | ||
02291680 | 1557 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
1558 | tbl[0].extra1 = all; |
1559 | tbl[0].extra2 = net; | |
2a75de0c | 1560 | #endif |
752d14dc PE |
1561 | } |
1562 | ||
1563 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 1564 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
1565 | if (err < 0) |
1566 | goto err_reg_all; | |
1567 | ||
f8572d8f | 1568 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
1569 | if (err < 0) |
1570 | goto err_reg_dflt; | |
1571 | ||
1572 | err = -ENOMEM; | |
1573 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1574 | if (forw_hdr == NULL) | |
1575 | goto err_reg_ctl; | |
2a75de0c | 1576 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1577 | #endif |
1578 | ||
752d14dc PE |
1579 | net->ipv4.devconf_all = all; |
1580 | net->ipv4.devconf_dflt = dflt; | |
1581 | return 0; | |
1582 | ||
1583 | #ifdef CONFIG_SYSCTL | |
1584 | err_reg_ctl: | |
1585 | __devinet_sysctl_unregister(dflt); | |
1586 | err_reg_dflt: | |
1587 | __devinet_sysctl_unregister(all); | |
1588 | err_reg_all: | |
1589 | if (tbl != ctl_forward_entry) | |
1590 | kfree(tbl); | |
752d14dc | 1591 | err_alloc_ctl: |
2a75de0c | 1592 | #endif |
752d14dc PE |
1593 | if (dflt != &ipv4_devconf_dflt) |
1594 | kfree(dflt); | |
1595 | err_alloc_dflt: | |
1596 | if (all != &ipv4_devconf) | |
1597 | kfree(all); | |
1598 | err_alloc_all: | |
1599 | return err; | |
1600 | } | |
1601 | ||
1602 | static __net_exit void devinet_exit_net(struct net *net) | |
1603 | { | |
2a75de0c | 1604 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1605 | struct ctl_table *tbl; |
1606 | ||
1607 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1608 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1609 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1610 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1611 | kfree(tbl); |
2a75de0c | 1612 | #endif |
752d14dc PE |
1613 | kfree(net->ipv4.devconf_dflt); |
1614 | kfree(net->ipv4.devconf_all); | |
1615 | } | |
1616 | ||
1617 | static __net_initdata struct pernet_operations devinet_ops = { | |
1618 | .init = devinet_init_net, | |
1619 | .exit = devinet_exit_net, | |
1620 | }; | |
1621 | ||
1da177e4 LT |
1622 | void __init devinet_init(void) |
1623 | { | |
752d14dc PE |
1624 | register_pernet_subsys(&devinet_ops); |
1625 | ||
1da177e4 LT |
1626 | register_gifconf(PF_INET, inet_gifconf); |
1627 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1628 | |
1629 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1630 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1631 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1632 | } |
1633 |